how to determine axle ratio?

Carlo Fanto
95

Asked by Carlo Dec 07, 2009 at 04:15 AM about the 2003 Chevrolet Suburban

Question type: General

How do you determine the axle ratio installed (stock) on a 2003 Suburban 4x4 (1500)? I was looking at tow ratings and noticed there were two listings provided for my vehicle (3.73 & 4.10, if I remember correctly).

5 Answers

Ricky Hayes
65

Jack up the rear end of the vehicle, Put a mark on the Drive Shaft, Spin the Rear wheel by hand one time and count how many times the drive shaft makes complete rotation. ex. If you spin the wheel one time and the drive shaft makes 3 & 3/4 spins then it is a 3.73. if it makes a little over 4 spins then its a 4.10. I may have it ass backwards to be honest with you though. it may be how many times the wheel spins for one drive shaft rotation. I hope this helps

2 out of 2 people think this is helpful.
Carlo Fanto
95

Thanks Ricky... someone mentioned about RPO codes stamped in the glovebox that determines the axle ratio from the factory on a late 90's Chevy... I wonder if that applies as well to my '03... I'll check if there's any coding stamped in the glove box in the mornin'... I appreciate your quick reply.

2 out of 2 people think this is helpful.
Carlo Fanto
95

99'Heartbeat posted this on the GMTruckClub forums: http://www.compnine.com/vid.php type in your VIN and it'll spit out all the RPO codes for your vehicle(s). I guess I've got myself a 3.73 axle ratio based on RPO code: GT4 w/ a 7200lb GVWR.

3 out of 3 people think this is helpful.
Fordtudor37
4,005

Somewhere on the driver's door or body area of your vehicle you will find a sticker that has the VIN across the top, GVR, tire size, and other information on it. At the bottom of that sticker it will show an "axle code". Take that information with the VIN number to any dealership and they can get the gear ratio and tell you what type of rear axle is in the vehicle. SOMETIMES, if you crawl underneath the truck, there will be a tag on the rear axle cover (held on by a bolt) and the gear ratio will be stamped into the metal tag.

2 out of 2 people think this is helpful.
Russ Hofer
0

The codes are on the sticker inside the glove box door.

Your Answer

Add photo

Related Questions

  • Towing Capacity 2 3 answers

    I am considering buying a 2009 LT2 1500 4WD with 3.42 differential and a "Z82" HD Towing Package. I have the build sheet and know that it does not have the K5L Tow package. The question is.... how m...

    2009 Chevrolet Suburban LT2 1500 4WD

    -

    General

  • can a 1500 series suburban tow a two horse trailer with two horses in it. 5 answers

    how much weight can a 1500 series suburban pull comfortably

    2013 Chevrolet Suburban Fleet 1500 4WD

    -

    General

  • max size without out tire rubbing and no lift 5 answers

    I own a 2007 Chevy suburban and need new tires. I see all different answers when I look on these forums. so I figured ill ask the question. can I fit 285/70 R17 tires under my suburban with changing a...

    2007 Chevrolet Suburban LT1 1500 4WD

    -

    General

  • Axle Ratios? 3 answers

    Just purchased 1990 1/2 ton 4x4. I am interested in what factory gear ratios I have? I don't know where to figure out without pulling diff covers. I have the 5.7ltr and 4spd manual trans.

    1990 Chevrolet Suburban V1500 4WD

    -

    Maintenance & Repair

  • what is the gear ratio 2 answers

    1985 suburban 4wheel dr. 350 eng automatic. Could you please tell me what the gear ratio is?

    1985 Chevrolet Suburban

    -

    Maintenance & Repair

Suburban
Looking for a Used Suburban in your area?
CarGurus has 20,146 nationwide Suburban listings starting at $1,995.
ZIP:

Search Chevrolet Suburban Questions

Chevrolet Suburban Experts

#1 Eric Fritz
Eric Fritz
Reputation 510
#2 John Saffrahn
John Saffrahn
Reputation 360
#3 Tom Demyan
Tom Demyan
Reputation 280
View All

Related Models For Sale

Used GMC Yukon XL"
409 Great Deals out of 10,923 listings starting at $2,500
Used Chevrolet Tahoe"
1,007 Great Deals out of 33,065 listings starting at $2,500
Used Ford Expedition"
576 Great Deals out of 18,207 listings starting at $800
Used GMC Yukon"
313 Great Deals out of 9,665 listings starting at $2,795
Used Cadillac Escalade ESV"
126 Great Deals out of 3,206 listings starting at $5,990
Used Cadillac Escalade"
249 Great Deals out of 6,765 listings starting at $3,999
Used Chevrolet Silverado 1500"
2,565 Great Deals out of 168,575 listings starting at $950
Used Ford Excursion"
25 Great Deals out of 950 listings starting at $3,900
Used Toyota Sequoia"
137 Great Deals out of 4,766 listings starting at $3,500
Used Ford F-150"
2,595 Great Deals out of 168,950 listings starting at $1,495
Used Lincoln Navigator"
139 Great Deals out of 4,663 listings starting at $2,950
Used Chevrolet Silverado 2500HD"
548 Great Deals out of 39,531 listings starting at $2,995
Used Dodge Durango"
379 Great Deals out of 21,588 listings starting at $1,400

Used Cars For Sale

2015 Chevrolet Suburban For Sale
6 Great Deals out of 7,379 listings starting at $51,243
2014 Chevrolet Suburban For Sale
168 Great Deals out of 2,224 listings starting at $29,999
2013 Chevrolet Suburban For Sale
82 Great Deals out of 1,164 listings starting at $26,000
2012 Chevrolet Suburban For Sale
33 Great Deals out of 637 listings starting at $23,989
2011 Chevrolet Suburban For Sale
63 Great Deals out of 1,032 listings starting at $16,975